wspoon: Update VRM I2C paths for the 5.0 kernel

In the 5.0 Linux kernel, an I2C device path segment changed:
    i2c@1e78a000 -> bus@1e78a000

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I8d1e9577798c648013b2b4965a364a078bb216e9
1 file changed